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Journal of Dairy Science Vol. 50 No. 5 655-658
© 1967 by American Dairy Science Association ®
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Effect of Temperature on Porosity of Dried Whole Milk Powder Granules

E. Berlin, E. D. DeVilbiss and M. J. Pallansch

Dairy Products Laboratory, Eastern Utilization Research and Development Division, USDA, Washington, D. C.

ABSTRACT

Densities of spray-dried whole milk foam were measured at 25, –80, and –195 C by pycnometric techniques, using He or N2 as the displaced medium. Evidence was obtained for marked thermal contraction of the powder particles at the lower temperatures, with associated closing of the pores on the powder surface. These effects were manifested in decreased rates of diffusion of the gases to the interior of the powder particles as the temperature was lowered.






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Copyright © 1967 by the American Dairy Science Association ®.